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This was a replacement BB for my mountain bike. I replaced it when I replaced my crank and front derailleur. I installed it on my own and it wasn't too hard to do. I had some problems getting my front derailleur back in line but now it works like a charm. Just make sure you have the right tools for the job.

Installed on Trek Verve 3 as a replacement for the stock Suntour NEX, 48/38/28 which wore out after riding 2000 mile this year. I bought this crank because I live just outside of Pittsburgh and it is mostly hills (other than the rails-to-trails bike paths). I wanted the slightly smaller gear rings for the middle and smaller gears. I also have long legs (34" inseam) so I also got the longer cranks arms to give me more torque.

Installation was very easy. My friend has a a very basic bicycle tool kit and we were able to replace the Crankset without difficulty. I also bought a bottom bracket but did not need to replace it. The stock bottom bracket on the Verve is compatible with the crankset.

Today I took it out and road up some 4% grades and a am very happy with the performance. With the smaller gears it is much easier to maintain my cadence when climbing and even though the gearing is lower resulting in faster climbing.

I have the UN-55 right now. If you are concerned about the plastic cup, then spend the extra $12 on the UN-55 to get the metal cup and then you can buy the UN-53 in the future for replacements and just re-use the metal cup. I'm close to 3k miles on the UN-55 and it's still perfectly smooth, so not sure how long it will be before I need a new one, but that's the plan anyway. :)

As always, make sure you measure properly, but also check the threads to make sure they are clean and sharp. Mine had a casting flaw that caused the BB to skip a thread and it was all downhill from there. Nice product from what I could tell, but not able to use it right now for other reasons.

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